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I use the LiteSpeed cache plugin. When I request for a domain key it always shows me the error. I tried many ways to solve it but I failed. Suddenly, I found this post. This is the post that I have been searching for a long time. My problem is Cloudflare. Bot fight mode blocks my LiteSpeed cache IP. Finally, I disabled it and got my domain key. Now my site is really fast by using the LiteSpeed cache plugin. If anyone is facing this problem then you can read this article. Hope you will solve your problem too.
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